Restore Accuracy After Bigger Tires: Put the finishing touch on your lifted ride with Rough Country's Speedometer Calibration Device. Designed for larger tire setups, this easy-to-use calibrator ensures your speedometer displays true readings - no more guessing your actual speed.Plug-and-Play Simplicity: Installation is quick and hassle-free. Just connect the device to your vehicle's Diagnostic Link Connector Port and in minutes your speedometer, shift points, and stability control are all recalibrated to factory precision.Optimized Performance and Control: Unlike simple readout changes, Rough Country's calibrator updates your vehicle's ECM to maintain accurate shift timing and reliable electronic stability control, keeping your driving experience smooth and safe.Built-In Diagnostic Reader: Manage "check engine" and "service" lights with ease. The calibrator reads and clears diagnostic trouble codes and even allows you to return to stock settings whenever needed - perfect before servicing your vehicle.Reliable and Backed by Warranty: Enjoy peace of mind knowing your investment is protected by Rough Country's 1-Year Warranty. Get professional-grade calibration and full system compatibility at an unbeatable value.